#669CC4
Closest named color: Greyblue (#77A1B5). oklch(67.1% 0.083 241.6), rgb(102, 156, 196).
Aa
Black text reads best on this color (7.11:1).
About this color
#669CC4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.083 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.035 away. Black text reads best on it, at 7.11:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.11:1 |
| White text | 2.95:1 |
Values
| HEX | #669CC4 |
| RGB | rgb(102, 156, 196) |
| HSL | hsl(206, 44%, 58%) |
| OKLCH | oklch(67.1% 0.083 241.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #669CC4 | 2.95:1 | Fails | Lc -61.2 | Content text, not long reading |
| Black text on #669CC4 | 7.11:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #669CC4 text on white | 2.95:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #669CC4 text on black | 7.11:1 | AAA | Lc -45.9 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C5E0
oklch(80.8% 0.052 243.1)
-
Step 400
400 (this color)
#669CC4
oklch(67.1% 0.083 241.6)
-
Step 500
500
#4891C4
oklch(63.2% 0.106 241.6)
-
Step 600
600
#257AB0
oklch(55.6% 0.115 241.7)
-
Step 700
700
#166797
oklch(49.2% 0.106 241.2)
-
Step 800
800
#16547B
oklch(42.7% 0.089 241.6)
-
Step 900
900
#1B4663
oklch(37.8% 0.069 241.4)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#669CC4 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #8B9CC6 | 0.044 |
| Deuteranopia (no green cones) | #7E92C3 | 0.037 |
| Tritanopia (no blue cones) | #3AA6A9 | 0.068 |
| Achromatopsia (no color) | #969696 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #669CC4
#669CC4
oklch(67.1% 0.083 241.6)
- #BB8A60
#BB8A60
oklch(67.1% 0.083 61.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #669CC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.035
- Faded Blue #658CBB ΔE 0.044
- Silver Lake Blue #778DA9 ΔE 0.050
- Bluegrey #85A3B2 ΔE 0.052
- Bluey Grey #89A0B0 ΔE 0.053
- Cool Gray #8D99AE ΔE 0.053
- Blue Grey #758DA3 ΔE 0.055
- Cadet Blue #5F9EA0 ΔE 0.058
Use #669CC4 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.